/**
 * Migration: 021 - feedback_event session_id, agent_id (Recall Quality Feedback Loop)
 * Version: 21.0
 */
import type Database from 'better-sqlite3';
import type { Migration } from '../types.js';
export declare class FeedbackEventAttributionMigration implements Migration {
    version: string;
    name: string;
    description: string;
    private tableExists;
    private columnExists;
    private indexExists;
    validateBefore(db: Database.Database): Promise<void>;
    up(db: Database.Database): Promise<void>;
    down(db: Database.Database): Promise<void>;
    validateAfter(db: Database.Database): Promise<void>;
}
export default FeedbackEventAttributionMigration;
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